Breaker roll for reducing machines



M. F. WILLIAMS. v BREAKER ROLL FOR REDUCING MACHINES.

APPLICATION FILED DEC-2, I920.

Patented Mar. 28, 1922.

awuamtoz caress stares rarest series.

MILTON E. \VILLIAMS,- LOUIS, MISSOURI, ASSIGNOR TO WILLIAIVIS PATENT CRUSHES 8n PULVERIZER COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION 01 lYiISSOU RI.

Specification of Letters Patent.

I BREAKER ROLL FOR RED'UGTNG llTACI-IINES.

Patented Mar. 28, 1922.

Application filed December 2, 1920. Serial No. 427,681.

' To all whom it may concern: I

Be it known that I, MILTON F. WILLIAMS, a citizen of the -United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Breaker Rolls for Reducing Machines, of

which the following is a specification. 7

This invention relates to certain new and useful improvementsin breaker rolls for r ducing machines, the peculiarities of which will be hereinafter described and claimed.

The main object of my invention'is to provide breaking means at the top of an arcuate cage surrounding a rotor to secure large area of grinding and discharge hrough said cage; secondly'to provide a breaking roll automatically rotated by the frictional resistance of the material being reduced between the hannners and rotor of said roll; and thirdly to regulate the automatic rotation of said roll.

In the accompanying drawing on which like reference letters indicate corresponding parts, Fig. 1 represents a vertical sectional elevation across the shaft of a'reducingmachine exemplifying my invention; F 2, an enlarged detail elevation of my breaker roll and its mounting with adjacent portions of the casing in section on the line -42 of Fig. 1; Fig. 3, an end view of the speed regulator for the breaker roll; and Fig. f, an end view of the breaker roll itself.

The letter A designates the shaft of a reducing mill, mounted in a casing B having a hopper C to which the delivery spout D is attachedin any suitable manner. Suitable lian'nners E are mounted on said shaft by means of hammer rods and discs, so as'to constitute a rotor that'is enclosed by a cage F of perforated plate, or other suitable material, that forms nearly a complete circle and extends downwardl from one side of the hopper C around and upwardly inclined to the other side of said hopper, where a breaker roll G is mounted in a recess H at the inner end of said hop er, so that the lowest element in the perip cry of the roll may be practically tangent to the hammer circle of said rotor. This roll is preferably corrugated and parallel to the shaft I on which it is mounted, and the serrations may be of large or small size, according to the material to be ground between the rotor and the lower serrations nearest to the hammer circle which act in conjunction with the semi-circular as shown in Fig.

rotor, to effect the preliminary breaking of the material that is fed to the hopper O by the spout or otherwise, and is regulated in its admission to the rotor chamber by means of a slide J mounted in the opposite side of the hopper from the breaker roll and inclined inward and downward under the roll as shown in Fig. 1. The serrations are preferably ratchet-faced with their radial faces nearest to the rotor, opposed to the rotation of the rotor as indicated by arrows in Fig. 1, whereby the material guided to the roll by the slide J, will be reduced between the hammer circle of the rotor and the adjacent lower serrations, or portion of the breaker roll; In this reduction a resistance is exerted by the material, which acts upon the roll to turn it. continually while the reduction continues especially when the roll is serrated and thereby will bring into operative position with respect to the hammer circle of the rotor, all the edges successively of the serrations, and secure even wear upon the roll, and long continued use of such a roll having the cutting edges due to the multiple number thereof.

In order to regulate the rotation of the breaker roll, I provide a retarding device b which frictional engagement is made with the roll, or operatively transferred to the roll; such as by means of a disc or drum It, mounted on the end of the shaft 1 extending beyond the boxes L in which said shaft is mounted. A strap M, preferably 3, is secured at one end in a slot of a lug N,'while the other end of the strap is bent outward and provided with a hole through which passes a bolt C, having a thumb nut P by which the end of the strap is brought toward :1 lug Q, opposite the lug N with regard to the shaft 1. The bolt 0 passes through the lug Q by an enlarged opening, and preferably has a coil spring R on the opposite side of the lug from the strap, so that a spring pressure may be exerted by the strap upon more or less of the circumference of the drum K, and by such frictional engagement, will variably regulate the automatically rotative speed of the breaker roll. It is desirable that the roll should rotate comparatively slow when acted on by the material being reduced between the rotor and the adjacent serrations or adjacent portion of the roll surface.

The boxes L supporting the shaft of said roll, are mounted in guides S on the outside of the casing or otherwise adapted to move tov ward andaway from the rotor. This adjustable movement is effected preferably by a pair of screw bolts '1 at each box, which bolts are threaded through the said lugs Q and N above and below the respective box L, and have jam nuts by which the bolts are fixed in any position, when the boxes are suitably adjusted to bring the serrations into the desired relation with respect to the hammer circle of the rotor. The shaft I passes through slotted openings in the casing as indicated in Figs. 1 and 2, toallow this radial adjustment of the breaker roll, so that any degree of fineness in reduction of material due to the corresponding degree of closeness in adjustment of said roll to the hammer circle, may be effected. The mounting of the strap M in the lugs Q and N, give suflicient play for this vertical or radial adjustment of said roll, as is evident from Fig. 3. v

By the location of the brezker roll as above described at the upper portion of the casing, only a small portion of the circumference of the cage is reserved for the entrance to the rotor chamher, and thereby all the balance of the cage is available as a screening surface, as indicated in Fig. 1. The upper portion of the casing forming the cover is preferably reversible upon the base of the casing, so that the rotor may turnin either direction according to requirements.

Since the inlet opening with the breaker roll or other breaking means is at the top of the arcuate cage, the cage inclines downward in both directions from the inlet, and the material passing through the cage will therefore slide off from the downwardly inclined surfaces of the upper portions of the cage, after passing through the cage, and a maximum cage surface is obtained for rinding and screening as shown in Fig. 1. in other forms of cage with side inlet, it is not practical to continue the cage around from one side of the inlet to the other behoppcr with its 7 cause the material passing through the cage will lodge at the top of the outside of the cage and will not slide off, and the maximum cage grinding and screening surface is not obtained as is the case in my construction.

I claim 1. A reducing machine comprising a casing, a rotor mounted in said casing, a rotary breaker roll having a portion of its surface successively lying in the path of said rotor so as to be rotated by the reduction of material between the rotor and roll, a drum 011 said shaft, a strap adjustably engaging said drum, and means to vary the adjustment of said strap and its frictional engagement with said drum.

2, A reducing machine comprising a casing having slotted openings with guides, slidable boxes mounted in said guides, a shaft passing through said slotted openings and carried by said boxes, a serrated breaker roll mounted on said shaft with an element substantially in contact with the hammer circle of hammers, and rotatable" by the reduction of the material being ground, rotary hammers mounted in said casing and co-acting with said breaker roll to grind fine or coarse according to the distance between said roll andthe hammer circle of said hammers, adjusting means for said slidable boxes to vary said distance accordingly, and retarding means controlling the rotation of said roll.

3. In a reducing machine, the combina-v tion with rotary hammers and an adjustable serrated breaker roll and rotated by the reduction of material between said hammers and serrations andhaving a friction drum, of retarding means for said roll comprising a friction strap slidably held by one end in lugs of said casing and engaging said drum, and an adjustable spring-controlled bolt connecting the other end of said strap yieldingly and adjustably to a lug of said casing, substantially as described V In testimony whereof I have allixed my signature.

MILTON F. lVILLIA MS. 

